Suspended: This interface has been be suspended from the V4L2 API implemented in Linux 2.6 until we have more experience with codec device interfaces.
A V4L2 codec can compress, decompress, transform, or otherwise
convert video data from one format into another format, in memory.
Applications send data to be converted to the driver through a
write() call, and receive the converted data through a
read() call. For efficiency a driver may also support streaming